public class belajarstatic {

    public static void main(String[] args)
    {
        Mahasiswa[] i = new Mahasiswa[5];

        i[0] = new Mahasiswa();
        i[0].nama = "joni";
        i[0].jurusan ="TIF";
        i[0].nim ="11751101";
        i[1]= new Mahasiswa();
        i[1].nama= "abel";
        i[1].jurusan = "TIF";
        i[1].nim ="11751102";

        i[2]= new Mahasiswa();
        i[2].nama= "clara";
        i[2].jurusan = "SIF";
        i[2].nim ="11751103";

        i[3]= new Mahasiswa();
        i[3].nama= "fadel";
        i[3].jurusan = "SIF";
        i[3].nim ="11751105";

        i[4]= new Mahasiswa();
        i[4].nama= "roni";
        i[4].jurusan = "TIF";
        i[4].nim ="11751121";

int g=0;
        for (int j = 0; j < i.length; j++) {
            for (int k = 0; k < i.length-j; k++) {
                if (i[g].nim.compareToIgnoreCase(i[k].nim)<0) {
                    g=k;
                }
            }
            Mahasiswa temp = i[i.length-1-j];
            i[i.length-1-j] = i[g];
            i[g] = temp;
            System.out.println((j+1)+". "+i[j].nim);
        }
    }
}